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1.It is actually remarkable that despite the infant being exposed to the virus multiple times daily for up to two years of their life.
exposed to 接触；暴露于
The soldiers in the open field were exposed to the enemy's gunfire.
旷野中的士兵遭到敌人炮火的攻击。
The broken windows left us exposed to the sub - zero temperatures.
破窗子使我们置身于零下温度的严寒之中。
2.The researchers exposed the TNC protein from breast milk of uninfected women to HIV, the protein linked up to the virus and made it harmless.
link up 会合；连接；联系
They have planned to link up the two areas by telephone.
他们计划用电话把两个地区连接起来。
Engineers can link up distant countries by radio or telephone.
工程师们用无线电或电话可把相距遥远的国家联系在一起。
